﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace SetHotkey
{
    class Hotkeys
    {
        public class AppHotKey
        {
            [DllImport("kernel32.dll")]
            public static extern uint GetLastError();
            //如果函数执行成功，返回值不为0。
            //如果函数执行失败，返回值为0。要得到扩展错误信息，调用GetLastError。
            [DllImport("user32.dll", SetLastError = true)]
            public static extern bool RegisterHotKey(
                IntPtr hWnd,                //要定义热键的窗口的句柄
                int id,                     //定义热键ID（不能与其它ID重复）           
                KeyModifiers fsModifiers,   //标识热键是否在按Alt、Ctrl、Shift、Windows等键时才会生效
                Keys vk                     //定义热键的内容
                );
            [DllImport("user32.dll", SetLastError = true)]
            public static extern bool UnregisterHotKey(
                IntPtr hWnd,                //要取消热键的窗口的句柄
                int id                      //要取消热键的ID
                );

            //定义了辅助键的名称（将数字转变为字符以便于记忆，也可去除此枚举而直接使用数值）
            [Flags()]
            public enum KeyModifiers
            {
                None = 0,
                Alt = 1,
                Ctrl = 2,
                Shift = 4,
                WindowsKey = 8
            }
            /// <summary>
            /// 注册热键
            /// </summary>
            /// <param name="hwnd">窗口句柄</param>
            /// <param name="hotKey_id">热键ID</param>
            /// <param name="keyModifiers">组合键</param>
            /// <param name="key">热键</param>
            public static void RegKey(IntPtr hwnd, int hotKey_id, KeyModifiers keyModifiers, Keys key)
            {
                try
                {
                    if (!RegisterHotKey(hwnd, hotKey_id, keyModifiers, key))
                    {
                        if (Marshal.GetLastWin32Error() == 1409) { MessageBox.Show("热键被占用 ！"); }
                        else
                        {
                            MessageBox.Show("注册热键失败！");
                        }
                    }
                }
                catch (Exception) { }
            }
            /// <summary>
            /// 注销热键
            /// </summary>
            /// <param name="hwnd">窗口句柄</param>
            /// <param name="hotKey_id">热键ID</param>
            public static void UnRegKey(IntPtr hwnd, int hotKey_id)
            {
                //注销Id号为hotKey_id的热键设定
                UnregisterHotKey(hwnd, hotKey_id);
            }
        }
    }
}


/*private const int WM_HOTKEY = 0x312; //窗口消息-热键
private const int WM_CREATE = 0x1; //窗口消息-创建
private const int WM_DESTROY = 0x2; //窗口消息-销毁
private const int Space = 0x3572; //热键ID
protected override void WndProc(ref Message m)
    {
        base.WndProc(ref m);
        switch (m.Msg)
        {
            case WM_HOTKEY: //窗口消息-热键ID
                switch (m.WParam.ToInt32())
                {
                    case Space: //热键ID
                        System.Console.WriteLine("Code Do It!");  //执行代码
                        break;
                    default:
                        break;
                }
                break;
            case WM_CREATE: //窗口消息-创建
                Hotkeys.AppHotKey.RegKey(Handle, Space, Hotkeys.AppHotKey.KeyModifiers.Ctrl, Keys.Q);  //热键
                break;
            case WM_DESTROY: //窗口消息-销毁
                Hotkeys.AppHotKey.UnRegKey(Handle, Space); //销毁热键
                break;
            default:
                break;
            }
        } */